Study on the corrosion residual strength of the 1.0 wt.% Ce modified AZ91 magnesium alloy
Study on the corrosion residual strength of the 1.0 wt.% Ce modified AZ91 magnesium alloy
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DOI：
10.1016/j.matchar.2009.09.014
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发表时间：
2010-01-01
影响因子：
4.7
通讯作者：
Zhang, Dawei
中科院分区：
文献类型：
--
作者：
Li, Chunfang;Liu, Yaohui;Zhang, Dawei
腐蚀对1.0 wt.%通过将试样浸入3.5wt.%的Ce溶液中，研究了Ce对AZ91镁合金的变质作用在NaCl水溶液中浸泡0、12、40、108、204、372和468 h后进行拉伸试验。用扫描电子显微镜对断口形貌进行了分析。结果表明，在试验时间内，点蚀是腐蚀残余强度下降的主要原因。通过光学显微镜统计和定量地获得腐蚀坑的深度，并将最大值记录为腐蚀坑的极限深度。此外，腐蚀残余强度与腐蚀坑的极限深度呈线性关系，这可以归因于横截面积的损失和腐蚀坑的产生和发展引起的应力集中的出现。(C)2009 Elsevier Inc. All rights reserved.
The effect of corrosion on the tensile behaviour of the 1.0 wt.% Ce modified AZ91 magnesium alloy was investigated by the immersion of the test bar in 3.5 wt.% NaCl aqueous solution for 0, 12,40, 108, 204, 372 and 468 h with the subsequent tensile tests in this paper. The fractography was analyzed by scanning electron microscopy. The results show that pitting corrosion should be responsible for the drop of the corrosion residual strength within the testing time. The depth of the corrosion pits was statistically and quantitatively obtained by an optical microscopy and the maximal value was recorded as the extreme depth of the corrosion pit. Furthermore, the corrosion residual strength is linearly dependent on the extreme depth of the corrosion pit, which can be attributed to the loss of cross-sectional area and the emergence of stress concentration caused by the initiation and development of corrosion pits. (C) 2009 Elsevier Inc. All rights reserved.